Penetration Testing mailing list archives

Re: [PEN-TEST] Home-Banking PEN-TESTING


From: Rafael Coninck Teigao <rafael () SAFECORE NET>
Date: Wed, 23 Aug 2000 10:47:34 -0300

Indeed, by next month I'm going to have a complete protocol to (IMHO) defeat this
kind of attack, and I'm going to publish it so I can hear from other developers
pros and cons of it.

    []'s,
    RCT.


Peter Van Epp wrote:

        The obvious one is insinuate BO2K on to the client machine. Security
gone since the attacker can simulate the client (with sniffed real password
from the client's machine). How would the bank differentiate this from the
real client? Why would the bank take responsibility for the client's machine?
I expect the card holder agreement holds the client liable for the security
of their machine in the fine print. Now for publicity reasons they may eat
this so as to not scare off other customers, and there isn't much useful
that you can do (at least on the local version our banks run, ymmv). The
one I expect to see the first big hit from is on line stock trading. The
potential loss is likely to be too high for a brokarage to swallow and I
expect the same thing applies i.e. the card holder agreement says if it was
with your password/passphrase it is considered you (unless you can prove that
the broker's end of the connection was compromised which no one in their
right mind would try given an undefended client machine). If you know of a
way to fix the client's machine in the general case, I (and I'm sure a lot
of other worried security people) would like to hear about it. BO2K will
defeat (with varying amounts of difficulty) even VPNs if you can get BO2K
on to the client machine in the first place (preventing which is the only
defence I'm aware of, and thats not trivial in a distributed case). Feel
free to substitute Sub7 or any of the 30 or 40 other equivelent to BO packages
floating around out there for BO2K in all instances here (because they are
equivelent ...).

--
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And the Raven, never flitting, still is sitting, still is sitting
On the pallid bust of Pallas just above my chamber door;
And his eyes have all the seeming of a demon's that is dreaming,
And the lamp - light o'er him streaming throws his shadow on the floor;
And my soul from out that shadow that lies floating on the floor
Shall be lifted - nevermore!
        E. A. Poe --> The Raven (c1845)
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